lily/audio-item.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2011 Jan Nieuwenhuizen <janneke@gnu.org>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "audio-item.hh"
  21
  22 #include "midi-item.hh"
  23 #include "audio-column.hh"
  24
  25 Audio_instrument::Audio_instrument (string instrument_string)
  26 {
  27   str_ = instrument_string;
  28 }
  29
  30 void
  31 Audio_item::render ()
  32 {
  33 }
  34
  35 Audio_column *
  36 Audio_item::get_column () const
  37 {
  38   return audio_column_;
  39 }
  40
  41 Audio_item::Audio_item ()
  42   : audio_column_ (0)
  43   , channel_ (0)
  44 {
  45 }
  46
  47 Audio_note::Audio_note (Pitch p, Moment m, bool tie_event, Pitch transposing)
  48 {
  49   pitch_ = p;
  50   length_mom_ = m;
  51   tied_ = 0;
  52   transposing_ = transposing;
  53   tie_event_ = tie_event;
  54   volume_ = 0;
  55 }
  56
  57 void
  58 Audio_note::tie_to (Audio_note *t, Moment skip)
  59 {
  60   tied_ = t;
  61   Audio_note *first = t;
  62   while (first->tied_)
  63     first = first->tied_;
  64   // Add the skip to the tied note and the length of the appended note
  65   // to the full duration of the tie...
  66   first->length_mom_ += skip + length_mom_;
  67   length_mom_ = 0;
  68 }
  69
  70 Audio_key::Audio_key (int acc, bool major)
  71 {
  72   accidentals_ = acc;
  73   major_ = major;
  74 }
  75
  76 Audio_dynamic::Audio_dynamic ()
  77 {
  78   volume_ = -1;
  79 }
  80
  81 Audio_span_dynamic::Audio_span_dynamic ()
  82 {
  83   grow_dir_ = CENTER;
  84 }
  85
  86 void
  87 Audio_span_dynamic::add_absolute (Audio_dynamic *d)
  88 {
  89   assert (d);
  90   dynamics_.push_back (d);
  91 }
  92
  93 Moment
  94 remap_grace_duration (Moment m)
  95 {
  96   return Moment (m.main_part_ + Rational (9,40) * m.grace_part_,
  97                  Rational (0));
  98 }
  99
 100 Real
 101 moment_to_real (Moment m)
 102 {
 103   return remap_grace_duration (m).main_part_.to_double ();
 104 }
 105
 106 int
 107 moment_to_ticks (Moment m)
 108 {
 109   return int (moment_to_real (m) * 384 * 4);
 110 }
 111
 112 void
 113 Audio_span_dynamic::render ()
 114 {
 115   if (dynamics_.size () <= 1)
 116     return ;
 117
 118   assert (dynamics_[0]->volume_ >= 0);
 119
 120   while  (dynamics_.back ()->volume_ > 0
 121           && dynamics_.size () > 1
 122           && sign (dynamics_.back ()->volume_ - dynamics_[0]->volume_) != grow_dir_)
 123     {
 124       dynamics_.erase (dynamics_.end () - 1);
 125     }
 126
 127   if (dynamics_.size () <= 1)
 128     {
 129       programming_error ("Impossible or ambiguous (de)crescendo in MIDI.");
 130       return ;
 131     }
 132
 133   Real delta_v = grow_dir_ * 0.1;
 134
 135   Real start_v = dynamics_[0]->volume_;
 136   if (dynamics_.back ()->volume_ < 0)
 137     dynamics_.back ()->volume_ = max (min (start_v + grow_dir_ * 0.25, 1.0), 0.1);
 138
 139   delta_v = dynamics_.back ()->volume_ - dynamics_[0]->volume_;
 140
 141   Moment start = dynamics_[0]->get_column ()->when ();
 142
 143   Real total_t = moment_to_real (dynamics_.back ()->get_column ()->when () - start);
 144
 145   for (vsize i = 1; i < dynamics_.size (); i ++)
 146     {
 147       Moment dt_moment = dynamics_[i]->get_column ()->when ()
 148         - start;
 149
 150       Real dt =  moment_to_real (dt_moment);
 151
 152       Real v = start_v + delta_v *  (dt / total_t);
 153
 154       dynamics_[i]->volume_ = v;
 155     }
 156 }
 157
 158
 159
 160 Audio_tempo::Audio_tempo (int per_minute_4)
 161 {
 162   per_minute_4_ = per_minute_4;
 163 }
 164
 165 Audio_time_signature::Audio_time_signature (int beats, int one_beat)
 166 {
 167   beats_ = beats;
 168   one_beat_ = one_beat;
 169 }
 170
 171 Audio_text::Audio_text (Audio_text::Type type, string text_string)
 172 {
 173   text_string_ = text_string;
 174   type_ = type;
 175 }
 176